Meanings of unmusical call in английском

There is rare music now in the unmusical call of the phœbe-bird- it is sosuggestive

Far down the widening valley, and up the wild, picturesque ravine, rang the strange but not unmusical call.

Their harsh, unmusical call-notes are similar too, and their hawk-like method of dropping suddenly upon a victim on the ground below is identical.

His harsh screams, shrieks, and most aggressive and unmusical calls seem often intended maliciously to drown the songs of the sweet-voiced singers.